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QUESTION
Using the w3schools.com SQL tutorial Northwind database, I'm trying to display the category that has the most products shipped. Additionally, I want to display the net income from all sales in that category. I can't figure out how to take the category with the most products shipped, and use the amount of products shipped to calculate the net income of that category. This is because there are many different products that have the same CategoryID but different prices.
...ANSWER
Answered 2021-Jan-25 at 07:24So first of all you get the income for each product and category and then based on that you find total income for that category and you do this with the help of subquery, then you join this resultant table with the category table and with the help of group by you find the product count and total income for each category, below is the sql query for more indepth understanding
QUESTION
My application returns a hash of keys and values and I'd like it to display them in an easily readable way. Is there a way I can get it to display the key's as well as the info. So if I search for a strain it will return something similar to this
ID: The ID number Name: The name Race: The race flavor: the flavor etc.
sample of what it prints:
...ANSWER
Answered 2020-Aug-06 at 04:05There is a great console library called Hirb which can be used just for this purpose.
For example, assuming your array of hashes is in data
, we can do this:
QUESTION
I am trying to build a program for my IT course. The point of the program is to have a client app to send commands to the server. It seemd to work pretty well until today where, after a few calls, when I receive a response from the server it is not up to date.
eg : I send a few commands that all work fine. But then send another command and receive the response from the previous one.
I checked the command sent by the client and it is the one I type and in the server part, when I receive a command from the client it is the one actually sent by the client (not the previous one)
Here is the Shell classes (in the server and client) that I use to send and receive messages aswell as an example on how I use it.
Server :
...ANSWER
Answered 2020-Aug-04 at 03:23Since you said the response is not up to date, I'm guessing you used TCP (you didn't post the socket creation). Like the comment mentioned, there are 2 things that you aren't doing right:
- Protocol: TCP gives you a stream, which is divided as the OS sees fit into packets. When transferring data over the network, the receiving end must know when it has a complete transmission. The easiest way to do that would be to send the length of the transmission, in a fixed format (say 4 bytes, big endian), before the transmission itself. Also, use sendall. For example:
QUESTION
Posting a React form is typically straightforward. However, I need to customize the payload before sending it to this particular endpoint. I need it to look like this:
...ANSWER
Answered 2020-Apr-23 at 01:27On change , set the event name and value to user.body.Item
not on user
QUESTION
ANSWER
Answered 2020-Mar-06 at 17:32You just need to remove your faulty baseref tag to make it work.
QUESTION
Here's some output to give an example of what I'm talking about. The debug messages don't come solely from the Aspect4J logger, they come from several other classes as well. I've debugged the application and found that the Root logger is set to DEBUG, then later on set to INFO after the Spring Banner is printed (I don't think the banner specifically has anything to do with it).
I don't have any logging related files on my classpath unless they've been added by a dependency I'm unaware of.
I also tried setting.
...ANSWER
Answered 2018-Nov-21 at 22:09I was able to trace the source of the problem back to the fact that Spring does not set the logging level until it initializes and runs the implementation class for org.springframework.boot.logging.LoggingSystem
. And when Logback boots up it sets the Root logger to DEBUG by default in the ch.qos.logback.classic.LoggerContext
class this.root.setLevel(Level.DEBUG)
.
I added the following code to a static initialization block inside of the class which contains the main() method that boots up the Spring application. The root logger gets fetched (which initializes it to DEBUG), and then cast to a Logback logger. Keep in mind this means this implementation of a fix is tied to the real logging implementation on the classpath. If I were doing all my logging through log4j or apache commons the logger I get from LoggerFactory.getLogger()
would be a different type and therefore need a different cast. This cast is necessary because the SLF4J facade does not expose methods to programmatically change the logging level. Once I had a refrence to the root logger, then I just set the level. This level is eventually overridden by Spring, so I'll need to do some more plumbing if I want to automagically keep the Spring settings and my initialization block the same.
QUESTION
Apologies if the title is confusing i wasn't too sure what else to call this question. Basically What I've accomplished so far is I've created a backup of a table ORDER_DETAIL and made the modifications to it so that when it runs the original data from table ORDER_DETAIL is inserted into a table ag715. The purpose of this is that when a separate script is ran called HACKER, this script changes ORDER_DETAIL.
My Task now is to compare the tables and show whats been deleted, inserted and updated. However my issue is when i run my backup file, ORDER_DETAIL is empty and ag715 has data so I'm unable to compare the tables.
My question is if my backup file was modified properly, or if its incorrect and deletes the contents of a table ORDER_DETAIL when ran?
...ANSWER
Answered 2019-Jun-08 at 00:00For this purpose, creating a new table maybe is not what you are looking for! Please review incremental backup solutions like Percona xtrabackup. I don't know why you do this, but maybe I should warn you, if you have some enterprise task, it is not a proper way to check the differences between data in the database layer! You should execute such processes at logic layer (with a proper programming language or scripting tools).
QUESTION
We are implementing a Kafka topic that is a 3 machine cluster. We are going to be pulling off of a Solace queue and are wondering what the tasks.max
parameter does and how it divides the messages. We do not have access to the solace queue and can only call and see if we are dropping messages off the buffer. any insight would be great!! Current system in a hornetQ and it is running 5 threads.
Enviroment:
- Distibuted mode
- 1 topic
- 3 replicas
- 5 partitions per machine
Solace-kafka-connector-source-master
We have tried it in standalone with a single task and it works. Since we don't control the solace queue we can see if we are dropping messages.
...ANSWER
Answered 2019-Apr-05 at 13:27max.tasks 1 would work with an Exclusive Queue since there can only be one active subscriber to that kind of Solace queue. It will also guarantee message order is preserved from Solace into Kafka.
If the Solace Queue is a Non-Exclusive (i.e. Shared) Queue then increasing the max.tasks will define an upper bound on the number of concurrent Solace clients consuming from the queue. This allows horizontal scaling using multiple consumers from the queue for better throughput. However Solace does not guarantee message order across multiple consumers of a Non-Exclusive Queue so message ordering may not be preserved.
In either case messages are not lost because they are not acknowledged back to Solace and deleted until after they successfully acknowledged to have been written to Kafka.
QUESTION
I have a task - "Group all products into categories, inside - by availability in stock, inside the last group, group by price."
Data:
...ANSWER
Answered 2018-Nov-10 at 08:01I believe this gives you what you want.
QUESTION
I am trying to populate a linked list with creatures from a file. However, when I do it reads the first one but no other creatures. I cannot pass an int to get the number of creatures because it is not static.
I have the following code
...ANSWER
Answered 2018-Feb-14 at 15:53After reading the double cost
, there's a newline waiting in the creatureFile
stream.
We need to advance past that with ignore()
before reading the next creature:
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